This specialization of std::ctype encapsulates character classification features for type char. Unlike general-purpose std::ctype, table lookup is used to classify characters. The base class std::ctype<char> implements character classification equivalent to the "C" locale. The classification rules can be extended or modified if constructed as std::ctype_byname<char> or as a user-defined derived facet. All std::istream formatted input functions are required to use std::ctype<char> for character classing during input parsing.

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